I leave my Honwave inflated & on a trailer outside all year round. I bought a Honwave cover from a dealer four years ago. It cost a fortune and it lasted only eighteen months. It did not cope well with uv, and deteriorated rapidly. I then tried a cover from Ducks back, which was a third of the price, and has lasted two years but won't last another year. I'll buy a uv resistant tarp next time.